How Can I add Custom resolution in Windows Vista

One of my customer came across an issue with custom resolution in Windows Vista. I checked in many forums and what I can see is in Windows Vista you cannot set Custom resolution??? But I am Not Sure. However, new Nvidia graphics cards may support it. If you wish to know more about what is Custom resolution and how to set it in Windows XP, please visit the link provided below:

http://www.nvidia.com/object/custom_resolutions.html

Custom resolutions allow end users to the ultimate flexibility to add virtually any resolution and refresh for their display. If users want to use a unique resolution or refresh rate that is not available through windows control panels, this control will let users manually add any mode. The software will perform a check to make sure the end user defined resolution and refresh rate are supported by the graphics card!!